"The Open Portals - Part 1" by Katelyn Rushe
Returning to her life on Earth hasn't been easy for young Amber Brenin. Rendered powerless and surrounded by people who don't believe her tales of inter-dimensional travel, she misses the world of Rökshena more than ever, and when her feelings for her father Robert also become strained, she comes to see her homeward as nothing but a prison. Even worse is the knowledge that she must stay away from Rökshena to protect it from the Black Gadget.
However, this soon changes when amber discovers that the four Voxacustos have found their way to Earth as well. Now forced to defend her homeworld from them, she must strike a bargain with the Black Gadget and journey back to Rökshena with Robert to obtain the element Faelodine, the Voxacustos' one weakness. Can Amber defeat her old enemies on Earth and keep Rökshena safe, or has she already doomed both worlds?
Also check out Parts 1 and 2 of "The Last Creator," now on sale for $1.99 each: